Robert Penz writes:
DNS is fundamental. If DNS blows up, you're dead in the water. There's noway around having functional DNS.I know but can I somehow force courier so that it does not lookup its own hostname?
Well, you have to turn off everything that uses DNS, in the esmtpd configuration file. Adding -nodnslookup to TCPDOPTS. Removing the BOFHCHECKDNS option. Also turning off all spf settings in the courier configuration file.
So, you can't do sender's domain verification. You can't do SPF lookups. Such is the price you'll pay for not using DNS.
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